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Name two techniques used to compress digital video. Why is compression particularly important for the transmission of digital video signals?
The microwave link in the question above is modified to increase the capacity of the link by adding more channels to increase the transmitted bit rate.
Find the poles and the zeros of X(z) and plot them on the z-plane. Is there a pole or zero at z=1? Explain.
Let x(t) = e^(j*pi*t/4). Find the corresponding system output y(t). Does the eigenfunction property hold? Explain.
Figure shows the response of a first-order filter to a step input. Estimate the half-power cut-off frequency of the filter and sketch its frequency.
Design a bandpass filter of 'Sallen and Key' topology and having the following characteristics fo = 3.3 kHz, Q = 2.2.
A plane metal shield offers an absorption loss of 30 dB at a frequency of 10 kHz to normally incident radiated emission.
Determine the frequency at which two 1 mm thick shields, one made of copper and the other of steel, will have the same shielding effectiveness.
The recording density (bits/inch) of the innermost and outermost tracks if the disk has a 6 inch diameter and the outermost track comes to 1 inch.
Let the disk receive a request to access a random sector on a random track and assume that the head starts at track 0 (the outmost track of the disk).
A 4 pole lap wound armature has 16 coils each with a resistance of 0.1 ohms. Calculate the resistance of the armature.
If the cable tested is 100m in length, Ra1 is 1,5 ohms, Rb1 is 1.0 ohm and Ra2 / Rb2 = 0.8, calculate the distance to the fault.
By working back from the output (or otherwise) to find the equivalent input resistance in order to determine the input voltage.
List and briefly describe the two (2) reasons given in your textbook for why developing software for wireless devices is challenging.
Attenuation is 0 dB from 0 Hz to 2.5 kHz. Phase angle decreases linearly with increasing frequency above 2.5 kHz. Above 5 kHz the filter has steadily increasing
If the magnitude of the spectrum increases to +6 dBm at 0 Hz, what is the increase in the voltage of the rectangular pulses?
Write down the equation for the occupied bandwidth of a digital band pass (radio) link that has ideal RRC filters with alpha = 0.4 and a symbol rate Rs sps.
A 1 volt peak sine wave signal at a frequency of 5 kHz is applied to the modulation terminal of the FM transmitter.
DSB-SC signals cannot be demodulated with an envelope detector. Describe one way in which a DSB-SC signal can be demodulated.
If the narrower RF channel of 20 kHz were used as in part (d) above, how would the performance of the audio signal at the receiver be changed?
Determine the distance to an earth fault on one of the cores of a uniform three-core underground cable. Ra = 2 ohms, Rb = 1 ohm and the cable length is 300 m.
The base-region is sufficiently thin (WB << LN, where LN is the electron diffusion length) as to allow us to assume a linear minority gradient dnB(x)/dx.
In comparing the behaviour of an n-channel MOSFET with a p-channel device having identical geometry and threshold voltage.
The signal from the radio's antenna is first amplified in an RF amplifier and then multiplied by a local oscillator signal.
There is a strong signal at the image frequency you found in part (b) above. The image signal is 40 dB stronger than the wanted signal.